iMac - Startup Issues

Just got my ne Imac and when I throw he swith or restart this is what I get.
Gret screen the what I call the "cprompt" screen" I see all the startup actvity the text scrolls up realy fast fils a page then it goes to the desktop.

Same thing on a shutdown...on a black screen I see exactly what is going on CPU halt etc...shutdown is only like 3 lines of text.